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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.io;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.annotations.Beta;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.base.Charsets;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.io.Closeable;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.io.EOFException;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.io.IOException;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.io.InputStream;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.io.InputStreamReader;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.io.OutputStream;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.io.OutputStreamWriter;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.io.Reader;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.io.StringReader;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.io.Writer;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.nio.CharBuffer;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import java.nio.charset.Charset;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import java.util.ArrayList;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import java.util.Arrays;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import java.util.List;<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>/**<a name="line.40"></a>
<span class="sourceLineNo">041</span> * Provides utility methods for working with character streams.<a name="line.41"></a>
<span class="sourceLineNo">042</span> *<a name="line.42"></a>
<span class="sourceLineNo">043</span> * &lt;p&gt;All method parameters must be non-null unless documented otherwise.<a name="line.43"></a>
<span class="sourceLineNo">044</span> *<a name="line.44"></a>
<span class="sourceLineNo">045</span> * &lt;p&gt;Some of the methods in this class take arguments with a generic type of<a name="line.45"></a>
<span class="sourceLineNo">046</span> * {@code Readable &amp; Closeable}. A {@link java.io.Reader} implements both of<a name="line.46"></a>
<span class="sourceLineNo">047</span> * those interfaces. Similarly for {@code Appendable &amp; Closeable} and<a name="line.47"></a>
<span class="sourceLineNo">048</span> * {@link java.io.Writer}.<a name="line.48"></a>
<span class="sourceLineNo">049</span> *<a name="line.49"></a>
<span class="sourceLineNo">050</span> * @author Chris Nokleberg<a name="line.50"></a>
<span class="sourceLineNo">051</span> * @author Bin Zhu<a name="line.51"></a>
<span class="sourceLineNo">052</span> * @since 1.0<a name="line.52"></a>
<span class="sourceLineNo">053</span> */<a name="line.53"></a>
<span class="sourceLineNo">054</span>@Beta<a name="line.54"></a>
<span class="sourceLineNo">055</span>public final class CharStreams {<a name="line.55"></a>
<span class="sourceLineNo">056</span>  private static final int BUF_SIZE = 0x800; // 2K chars (4K bytes)<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>  private CharStreams() {}<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>  /**<a name="line.60"></a>
<span class="sourceLineNo">061</span>   * Returns a factory that will supply instances of {@link StringReader} that<a name="line.61"></a>
<span class="sourceLineNo">062</span>   * read a string value.<a name="line.62"></a>
<span class="sourceLineNo">063</span>   *<a name="line.63"></a>
<span class="sourceLineNo">064</span>   * @param value the string to read<a name="line.64"></a>
<span class="sourceLineNo">065</span>   * @return the factory<a name="line.65"></a>
<span class="sourceLineNo">066</span>   */<a name="line.66"></a>
<span class="sourceLineNo">067</span>  public static InputSupplier&lt;StringReader&gt; newReaderSupplier(<a name="line.67"></a>
<span class="sourceLineNo">068</span>      final String value) {<a name="line.68"></a>
<span class="sourceLineNo">069</span>    checkNotNull(value);<a name="line.69"></a>
<span class="sourceLineNo">070</span>    return new InputSupplier&lt;StringReader&gt;() {<a name="line.70"></a>
<span class="sourceLineNo">071</span>      @Override<a name="line.71"></a>
<span class="sourceLineNo">072</span>      public StringReader getInput() {<a name="line.72"></a>
<span class="sourceLineNo">073</span>        return new StringReader(value);<a name="line.73"></a>
<span class="sourceLineNo">074</span>      }<a name="line.74"></a>
<span class="sourceLineNo">075</span>    };<a name="line.75"></a>
<span class="sourceLineNo">076</span>  }<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span>  /**<a name="line.78"></a>
<span class="sourceLineNo">079</span>   * Returns a factory that will supply instances of {@link InputStreamReader},<a name="line.79"></a>
<span class="sourceLineNo">080</span>   * using the given {@link InputStream} factory and character set.<a name="line.80"></a>
<span class="sourceLineNo">081</span>   *<a name="line.81"></a>
<span class="sourceLineNo">082</span>   * @param in the factory that will be used to open input streams<a name="line.82"></a>
<span class="sourceLineNo">083</span>   * @param charset the charset used to decode the input stream; see {@link<a name="line.83"></a>
<span class="sourceLineNo">084</span>   *     Charsets} for helpful predefined constants<a name="line.84"></a>
<span class="sourceLineNo">085</span>   * @return the factory<a name="line.85"></a>
<span class="sourceLineNo">086</span>   */<a name="line.86"></a>
<span class="sourceLineNo">087</span>  public static InputSupplier&lt;InputStreamReader&gt; newReaderSupplier(<a name="line.87"></a>
<span class="sourceLineNo">088</span>      final InputSupplier&lt;? extends InputStream&gt; in, final Charset charset) {<a name="line.88"></a>
<span class="sourceLineNo">089</span>    checkNotNull(in);<a name="line.89"></a>
<span class="sourceLineNo">090</span>    checkNotNull(charset);<a name="line.90"></a>
<span class="sourceLineNo">091</span>    return new InputSupplier&lt;InputStreamReader&gt;() {<a name="line.91"></a>
<span class="sourceLineNo">092</span>      @Override<a name="line.92"></a>
<span class="sourceLineNo">093</span>      public InputStreamReader getInput() throws IOException {<a name="line.93"></a>
<span class="sourceLineNo">094</span>        return new InputStreamReader(in.getInput(), charset);<a name="line.94"></a>
<span class="sourceLineNo">095</span>      }<a name="line.95"></a>
<span class="sourceLineNo">096</span>    };<a name="line.96"></a>
<span class="sourceLineNo">097</span>  }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span>  /**<a name="line.99"></a>
<span class="sourceLineNo">100</span>   * Returns a factory that will supply instances of {@link OutputStreamWriter},<a name="line.100"></a>
<span class="sourceLineNo">101</span>   * using the given {@link OutputStream} factory and character set.<a name="line.101"></a>
<span class="sourceLineNo">102</span>   *<a name="line.102"></a>
<span class="sourceLineNo">103</span>   * @param out the factory that will be used to open output streams<a name="line.103"></a>
<span class="sourceLineNo">104</span>   * @param charset the charset used to encode the output stream; see {@link<a name="line.104"></a>
<span class="sourceLineNo">105</span>   *     Charsets} for helpful predefined constants<a name="line.105"></a>
<span class="sourceLineNo">106</span>   * @return the factory<a name="line.106"></a>
<span class="sourceLineNo">107</span>   */<a name="line.107"></a>
<span class="sourceLineNo">108</span>  public static OutputSupplier&lt;OutputStreamWriter&gt; newWriterSupplier(<a name="line.108"></a>
<span class="sourceLineNo">109</span>      final OutputSupplier&lt;? extends OutputStream&gt; out, final Charset charset) {<a name="line.109"></a>
<span class="sourceLineNo">110</span>    checkNotNull(out);<a name="line.110"></a>
<span class="sourceLineNo">111</span>    checkNotNull(charset);<a name="line.111"></a>
<span class="sourceLineNo">112</span>    return new OutputSupplier&lt;OutputStreamWriter&gt;() {<a name="line.112"></a>
<span class="sourceLineNo">113</span>      @Override<a name="line.113"></a>
<span class="sourceLineNo">114</span>      public OutputStreamWriter getOutput() throws IOException {<a name="line.114"></a>
<span class="sourceLineNo">115</span>        return new OutputStreamWriter(out.getOutput(), charset);<a name="line.115"></a>
<span class="sourceLineNo">116</span>      }<a name="line.116"></a>
<span class="sourceLineNo">117</span>    };<a name="line.117"></a>
<span class="sourceLineNo">118</span>  }<a name="line.118"></a>
<span class="sourceLineNo">119</span><a name="line.119"></a>
<span class="sourceLineNo">120</span>  /**<a name="line.120"></a>
<span class="sourceLineNo">121</span>   * Writes a character sequence (such as a string) to an appendable<a name="line.121"></a>
<span class="sourceLineNo">122</span>   * object from the given supplier.<a name="line.122"></a>
<span class="sourceLineNo">123</span>   *<a name="line.123"></a>
<span class="sourceLineNo">124</span>   * @param from the character sequence to write<a name="line.124"></a>
<span class="sourceLineNo">125</span>   * @param to the output supplier<a name="line.125"></a>
<span class="sourceLineNo">126</span>   * @throws IOException if an I/O error occurs<a name="line.126"></a>
<span class="sourceLineNo">127</span>   */<a name="line.127"></a>
<span class="sourceLineNo">128</span>  public static &lt;W extends Appendable &amp; Closeable&gt; void write(CharSequence from,<a name="line.128"></a>
<span class="sourceLineNo">129</span>      OutputSupplier&lt;W&gt; to) throws IOException {<a name="line.129"></a>
<span class="sourceLineNo">130</span>    checkNotNull(from);<a name="line.130"></a>
<span class="sourceLineNo">131</span>    Closer closer = Closer.create();<a name="line.131"></a>
<span class="sourceLineNo">132</span>    try {<a name="line.132"></a>
<span class="sourceLineNo">133</span>      W out = closer.add(to.getOutput());<a name="line.133"></a>
<span class="sourceLineNo">134</span>      out.append(from);<a name="line.134"></a>
<span class="sourceLineNo">135</span>    } catch (Throwable e) {<a name="line.135"></a>
<span class="sourceLineNo">136</span>      throw closer.rethrow(e, IOException.class);<a name="line.136"></a>
<span class="sourceLineNo">137</span>    } finally {<a name="line.137"></a>
<span class="sourceLineNo">138</span>      closer.close();<a name="line.138"></a>
<span class="sourceLineNo">139</span>    }<a name="line.139"></a>
<span class="sourceLineNo">140</span>  }<a name="line.140"></a>
<span class="sourceLineNo">141</span><a name="line.141"></a>
<span class="sourceLineNo">142</span>  /**<a name="line.142"></a>
<span class="sourceLineNo">143</span>   * Opens {@link Readable} and {@link Appendable} objects from the<a name="line.143"></a>
<span class="sourceLineNo">144</span>   * given factories, copies all characters between the two, and closes<a name="line.144"></a>
<span class="sourceLineNo">145</span>   * them.<a name="line.145"></a>
<span class="sourceLineNo">146</span>   *<a name="line.146"></a>
<span class="sourceLineNo">147</span>   * @param from the input factory<a name="line.147"></a>
<span class="sourceLineNo">148</span>   * @param to the output factory<a name="line.148"></a>
<span class="sourceLineNo">149</span>   * @return the number of characters copied<a name="line.149"></a>
<span class="sourceLineNo">150</span>   * @throws IOException if an I/O error occurs<a name="line.150"></a>
<span class="sourceLineNo">151</span>   */<a name="line.151"></a>
<span class="sourceLineNo">152</span>  public static &lt;R extends Readable &amp; Closeable,<a name="line.152"></a>
<span class="sourceLineNo">153</span>      W extends Appendable &amp; Closeable&gt; long copy(InputSupplier&lt;R&gt; from,<a name="line.153"></a>
<span class="sourceLineNo">154</span>      OutputSupplier&lt;W&gt; to) throws IOException {<a name="line.154"></a>
<span class="sourceLineNo">155</span>    checkNotNull(from);<a name="line.155"></a>
<span class="sourceLineNo">156</span>    checkNotNull(to);<a name="line.156"></a>
<span class="sourceLineNo">157</span>    Closer closer = Closer.create();<a name="line.157"></a>
<span class="sourceLineNo">158</span>    try {<a name="line.158"></a>
<span class="sourceLineNo">159</span>      R in = closer.add(from.getInput());<a name="line.159"></a>
<span class="sourceLineNo">160</span>      W out = closer.add(to.getOutput());<a name="line.160"></a>
<span class="sourceLineNo">161</span>      return copy(in, out);<a name="line.161"></a>
<span class="sourceLineNo">162</span>    } catch (Throwable e) {<a name="line.162"></a>
<span class="sourceLineNo">163</span>      throw closer.rethrow(e, IOException.class);<a name="line.163"></a>
<span class="sourceLineNo">164</span>    } finally {<a name="line.164"></a>
<span class="sourceLineNo">165</span>      closer.close();<a name="line.165"></a>
<span class="sourceLineNo">166</span>    }<a name="line.166"></a>
<span class="sourceLineNo">167</span>  }<a name="line.167"></a>
<span class="sourceLineNo">168</span><a name="line.168"></a>
<span class="sourceLineNo">169</span>  /**<a name="line.169"></a>
<span class="sourceLineNo">170</span>   * Opens a {@link Readable} object from the supplier, copies all characters<a name="line.170"></a>
<span class="sourceLineNo">171</span>   * to the {@link Appendable} object, and closes the input. Does not close<a name="line.171"></a>
<span class="sourceLineNo">172</span>   * or flush the output.<a name="line.172"></a>
<span class="sourceLineNo">173</span>   *<a name="line.173"></a>
<span class="sourceLineNo">174</span>   * @param from the input factory<a name="line.174"></a>
<span class="sourceLineNo">175</span>   * @param to the object to write to<a name="line.175"></a>
<span class="sourceLineNo">176</span>   * @return the number of characters copied<a name="line.176"></a>
<span class="sourceLineNo">177</span>   * @throws IOException if an I/O error occurs<a name="line.177"></a>
<span class="sourceLineNo">178</span>   */<a name="line.178"></a>
<span class="sourceLineNo">179</span>  public static &lt;R extends Readable &amp; Closeable&gt; long copy(<a name="line.179"></a>
<span class="sourceLineNo">180</span>      InputSupplier&lt;R&gt; from, Appendable to) throws IOException {<a name="line.180"></a>
<span class="sourceLineNo">181</span>    checkNotNull(from);<a name="line.181"></a>
<span class="sourceLineNo">182</span>    checkNotNull(to);<a name="line.182"></a>
<span class="sourceLineNo">183</span>    Closer closer = Closer.create();<a name="line.183"></a>
<span class="sourceLineNo">184</span>    try {<a name="line.184"></a>
<span class="sourceLineNo">185</span>      R in = closer.add(from.getInput());<a name="line.185"></a>
<span class="sourceLineNo">186</span>      return copy(in, to);<a name="line.186"></a>
<span class="sourceLineNo">187</span>    } catch (Throwable e) {<a name="line.187"></a>
<span class="sourceLineNo">188</span>      throw closer.rethrow(e, IOException.class);<a name="line.188"></a>
<span class="sourceLineNo">189</span>    } finally {<a name="line.189"></a>
<span class="sourceLineNo">190</span>      closer.close();<a name="line.190"></a>
<span class="sourceLineNo">191</span>    }<a name="line.191"></a>
<span class="sourceLineNo">192</span>  }<a name="line.192"></a>
<span class="sourceLineNo">193</span><a name="line.193"></a>
<span class="sourceLineNo">194</span>  /**<a name="line.194"></a>
<span class="sourceLineNo">195</span>   * Copies all characters between the {@link Readable} and {@link Appendable}<a name="line.195"></a>
<span class="sourceLineNo">196</span>   * objects. Does not close or flush either object.<a name="line.196"></a>
<span class="sourceLineNo">197</span>   *<a name="line.197"></a>
<span class="sourceLineNo">198</span>   * @param from the object to read from<a name="line.198"></a>
<span class="sourceLineNo">199</span>   * @param to the object to write to<a name="line.199"></a>
<span class="sourceLineNo">200</span>   * @return the number of characters copied<a name="line.200"></a>
<span class="sourceLineNo">201</span>   * @throws IOException if an I/O error occurs<a name="line.201"></a>
<span class="sourceLineNo">202</span>   */<a name="line.202"></a>
<span class="sourceLineNo">203</span>  public static long copy(Readable from, Appendable to) throws IOException {<a name="line.203"></a>
<span class="sourceLineNo">204</span>    checkNotNull(from);<a name="line.204"></a>
<span class="sourceLineNo">205</span>    checkNotNull(to);<a name="line.205"></a>
<span class="sourceLineNo">206</span>    CharBuffer buf = CharBuffer.allocate(BUF_SIZE);<a name="line.206"></a>
<span class="sourceLineNo">207</span>    long total = 0;<a name="line.207"></a>
<span class="sourceLineNo">208</span>    while (from.read(buf) != -1) {<a name="line.208"></a>
<span class="sourceLineNo">209</span>      buf.flip();<a name="line.209"></a>
<span class="sourceLineNo">210</span>      to.append(buf);<a name="line.210"></a>
<span class="sourceLineNo">211</span>      total += buf.remaining();<a name="line.211"></a>
<span class="sourceLineNo">212</span>      buf.clear();<a name="line.212"></a>
<span class="sourceLineNo">213</span>    }<a name="line.213"></a>
<span class="sourceLineNo">214</span>    return total;<a name="line.214"></a>
<span class="sourceLineNo">215</span>  }<a name="line.215"></a>
<span class="sourceLineNo">216</span><a name="line.216"></a>
<span class="sourceLineNo">217</span>  /**<a name="line.217"></a>
<span class="sourceLineNo">218</span>   * Reads all characters from a {@link Readable} object into a {@link String}.<a name="line.218"></a>
<span class="sourceLineNo">219</span>   * Does not close the {@code Readable}.<a name="line.219"></a>
<span class="sourceLineNo">220</span>   *<a name="line.220"></a>
<span class="sourceLineNo">221</span>   * @param r the object to read from<a name="line.221"></a>
<span class="sourceLineNo">222</span>   * @return a string containing all the characters<a name="line.222"></a>
<span class="sourceLineNo">223</span>   * @throws IOException if an I/O error occurs<a name="line.223"></a>
<span class="sourceLineNo">224</span>   */<a name="line.224"></a>
<span class="sourceLineNo">225</span>  public static String toString(Readable r) throws IOException {<a name="line.225"></a>
<span class="sourceLineNo">226</span>    return toStringBuilder(r).toString();<a name="line.226"></a>
<span class="sourceLineNo">227</span>  }<a name="line.227"></a>
<span class="sourceLineNo">228</span><a name="line.228"></a>
<span class="sourceLineNo">229</span>  /**<a name="line.229"></a>
<span class="sourceLineNo">230</span>   * Returns the characters from a {@link Readable} &amp; {@link Closeable} object<a name="line.230"></a>
<span class="sourceLineNo">231</span>   * supplied by a factory as a {@link String}.<a name="line.231"></a>
<span class="sourceLineNo">232</span>   *<a name="line.232"></a>
<span class="sourceLineNo">233</span>   * @param supplier the factory to read from<a name="line.233"></a>
<span class="sourceLineNo">234</span>   * @return a string containing all the characters<a name="line.234"></a>
<span class="sourceLineNo">235</span>   * @throws IOException if an I/O error occurs<a name="line.235"></a>
<span class="sourceLineNo">236</span>   */<a name="line.236"></a>
<span class="sourceLineNo">237</span>  public static &lt;R extends Readable &amp; Closeable&gt; String toString(<a name="line.237"></a>
<span class="sourceLineNo">238</span>      InputSupplier&lt;R&gt; supplier) throws IOException {<a name="line.238"></a>
<span class="sourceLineNo">239</span>    return toStringBuilder(supplier).toString();<a name="line.239"></a>
<span class="sourceLineNo">240</span>  }<a name="line.240"></a>
<span class="sourceLineNo">241</span><a name="line.241"></a>
<span class="sourceLineNo">242</span>  /**<a name="line.242"></a>
<span class="sourceLineNo">243</span>   * Reads all characters from a {@link Readable} object into a new<a name="line.243"></a>
<span class="sourceLineNo">244</span>   * {@link StringBuilder} instance. Does not close the {@code Readable}.<a name="line.244"></a>
<span class="sourceLineNo">245</span>   *<a name="line.245"></a>
<span class="sourceLineNo">246</span>   * @param r the object to read from<a name="line.246"></a>
<span class="sourceLineNo">247</span>   * @return a {@link StringBuilder} containing all the characters<a name="line.247"></a>
<span class="sourceLineNo">248</span>   * @throws IOException if an I/O error occurs<a name="line.248"></a>
<span class="sourceLineNo">249</span>   */<a name="line.249"></a>
<span class="sourceLineNo">250</span>  private static StringBuilder toStringBuilder(Readable r) throws IOException {<a name="line.250"></a>
<span class="sourceLineNo">251</span>    StringBuilder sb = new StringBuilder();<a name="line.251"></a>
<span class="sourceLineNo">252</span>    copy(r, sb);<a name="line.252"></a>
<span class="sourceLineNo">253</span>    return sb;<a name="line.253"></a>
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<span class="sourceLineNo">255</span><a name="line.255"></a>
<span class="sourceLineNo">256</span>  /**<a name="line.256"></a>
<span class="sourceLineNo">257</span>   * Returns the characters from a {@link Readable} &amp; {@link Closeable} object<a name="line.257"></a>
<span class="sourceLineNo">258</span>   * supplied by a factory as a new {@link StringBuilder} instance.<a name="line.258"></a>
<span class="sourceLineNo">259</span>   *<a name="line.259"></a>
<span class="sourceLineNo">260</span>   * @param supplier the factory to read from<a name="line.260"></a>
<span class="sourceLineNo">261</span>   * @throws IOException if an I/O error occurs<a name="line.261"></a>
<span class="sourceLineNo">262</span>   */<a name="line.262"></a>
<span class="sourceLineNo">263</span>  private static &lt;R extends Readable &amp; Closeable&gt; StringBuilder toStringBuilder(<a name="line.263"></a>
<span class="sourceLineNo">264</span>      InputSupplier&lt;R&gt; supplier) throws IOException {<a name="line.264"></a>
<span class="sourceLineNo">265</span>    Closer closer = Closer.create();<a name="line.265"></a>
<span class="sourceLineNo">266</span>    try {<a name="line.266"></a>
<span class="sourceLineNo">267</span>      R r = closer.add(supplier.getInput());<a name="line.267"></a>
<span class="sourceLineNo">268</span>      return toStringBuilder(r);<a name="line.268"></a>
<span class="sourceLineNo">269</span>    } catch (Throwable e) {<a name="line.269"></a>
<span class="sourceLineNo">270</span>      throw closer.rethrow(e, IOException.class);<a name="line.270"></a>
<span class="sourceLineNo">271</span>    } finally {<a name="line.271"></a>
<span class="sourceLineNo">272</span>      closer.close();<a name="line.272"></a>
<span class="sourceLineNo">273</span>    }<a name="line.273"></a>
<span class="sourceLineNo">274</span>  }<a name="line.274"></a>
<span class="sourceLineNo">275</span><a name="line.275"></a>
<span class="sourceLineNo">276</span>  /**<a name="line.276"></a>
<span class="sourceLineNo">277</span>   * Reads the first line from a {@link Readable} &amp; {@link Closeable} object<a name="line.277"></a>
<span class="sourceLineNo">278</span>   * supplied by a factory. The line does not include line-termination<a name="line.278"></a>
<span class="sourceLineNo">279</span>   * characters, but does include other leading and trailing whitespace.<a name="line.279"></a>
<span class="sourceLineNo">280</span>   *<a name="line.280"></a>
<span class="sourceLineNo">281</span>   * @param supplier the factory to read from<a name="line.281"></a>
<span class="sourceLineNo">282</span>   * @return the first line, or null if the reader is empty<a name="line.282"></a>
<span class="sourceLineNo">283</span>   * @throws IOException if an I/O error occurs<a name="line.283"></a>
<span class="sourceLineNo">284</span>   */<a name="line.284"></a>
<span class="sourceLineNo">285</span>  public static &lt;R extends Readable &amp; Closeable&gt; String readFirstLine(<a name="line.285"></a>
<span class="sourceLineNo">286</span>      InputSupplier&lt;R&gt; supplier) throws IOException {<a name="line.286"></a>
<span class="sourceLineNo">287</span>    Closer closer = Closer.create();<a name="line.287"></a>
<span class="sourceLineNo">288</span>    try {<a name="line.288"></a>
<span class="sourceLineNo">289</span>      R r = closer.add(supplier.getInput());<a name="line.289"></a>
<span class="sourceLineNo">290</span>      return new LineReader(r).readLine();<a name="line.290"></a>
<span class="sourceLineNo">291</span>    } catch (Throwable e) {<a name="line.291"></a>
<span class="sourceLineNo">292</span>      throw closer.rethrow(e, IOException.class);<a name="line.292"></a>
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<span class="sourceLineNo">294</span>      closer.close();<a name="line.294"></a>
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<span class="sourceLineNo">297</span><a name="line.297"></a>
<span class="sourceLineNo">298</span>  /**<a name="line.298"></a>
<span class="sourceLineNo">299</span>   * Reads all of the lines from a {@link Readable} &amp; {@link Closeable} object<a name="line.299"></a>
<span class="sourceLineNo">300</span>   * supplied by a factory. The lines do not include line-termination<a name="line.300"></a>
<span class="sourceLineNo">301</span>   * characters, but do include other leading and trailing whitespace.<a name="line.301"></a>
<span class="sourceLineNo">302</span>   *<a name="line.302"></a>
<span class="sourceLineNo">303</span>   * @param supplier the factory to read from<a name="line.303"></a>
<span class="sourceLineNo">304</span>   * @return a mutable {@link List} containing all the lines<a name="line.304"></a>
<span class="sourceLineNo">305</span>   * @throws IOException if an I/O error occurs<a name="line.305"></a>
<span class="sourceLineNo">306</span>   */<a name="line.306"></a>
<span class="sourceLineNo">307</span>  public static &lt;R extends Readable &amp; Closeable&gt; List&lt;String&gt; readLines(<a name="line.307"></a>
<span class="sourceLineNo">308</span>      InputSupplier&lt;R&gt; supplier) throws IOException {<a name="line.308"></a>
<span class="sourceLineNo">309</span>    Closer closer = Closer.create();<a name="line.309"></a>
<span class="sourceLineNo">310</span>    try {<a name="line.310"></a>
<span class="sourceLineNo">311</span>      R r = closer.add(supplier.getInput());<a name="line.311"></a>
<span class="sourceLineNo">312</span>      return readLines(r);<a name="line.312"></a>
<span class="sourceLineNo">313</span>    } catch (Throwable e) {<a name="line.313"></a>
<span class="sourceLineNo">314</span>      throw closer.rethrow(e, IOException.class);<a name="line.314"></a>
<span class="sourceLineNo">315</span>    } finally {<a name="line.315"></a>
<span class="sourceLineNo">316</span>      closer.close();<a name="line.316"></a>
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<span class="sourceLineNo">319</span><a name="line.319"></a>
<span class="sourceLineNo">320</span>  /**<a name="line.320"></a>
<span class="sourceLineNo">321</span>   * Reads all of the lines from a {@link Readable} object. The lines do<a name="line.321"></a>
<span class="sourceLineNo">322</span>   * not include line-termination characters, but do include other<a name="line.322"></a>
<span class="sourceLineNo">323</span>   * leading and trailing whitespace.<a name="line.323"></a>
<span class="sourceLineNo">324</span>   *<a name="line.324"></a>
<span class="sourceLineNo">325</span>   * &lt;p&gt;Does not close the {@code Readable}. If reading files or resources you<a name="line.325"></a>
<span class="sourceLineNo">326</span>   * should use the {@link Files#readLines} and {@link Resources#readLines}<a name="line.326"></a>
<span class="sourceLineNo">327</span>   * methods.<a name="line.327"></a>
<span class="sourceLineNo">328</span>   *<a name="line.328"></a>
<span class="sourceLineNo">329</span>   * @param r the object to read from<a name="line.329"></a>
<span class="sourceLineNo">330</span>   * @return a mutable {@link List} containing all the lines<a name="line.330"></a>
<span class="sourceLineNo">331</span>   * @throws IOException if an I/O error occurs<a name="line.331"></a>
<span class="sourceLineNo">332</span>   */<a name="line.332"></a>
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<span class="sourceLineNo">335</span>    LineReader lineReader = new LineReader(r);<a name="line.335"></a>
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<span class="sourceLineNo">337</span>    while ((line = lineReader.readLine()) != null) {<a name="line.337"></a>
<span class="sourceLineNo">338</span>      result.add(line);<a name="line.338"></a>
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<span class="sourceLineNo">340</span>    return result;<a name="line.340"></a>
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<span class="sourceLineNo">342</span><a name="line.342"></a>
<span class="sourceLineNo">343</span>  /**<a name="line.343"></a>
<span class="sourceLineNo">344</span>   * Streams lines from a {@link Readable} and {@link Closeable} object<a name="line.344"></a>
<span class="sourceLineNo">345</span>   * supplied by a factory, stopping when our callback returns false, or we<a name="line.345"></a>
<span class="sourceLineNo">346</span>   * have read all of the lines.<a name="line.346"></a>
<span class="sourceLineNo">347</span>   *<a name="line.347"></a>
<span class="sourceLineNo">348</span>   * @param supplier the factory to read from<a name="line.348"></a>
<span class="sourceLineNo">349</span>   * @param callback the LineProcessor to use to handle the lines<a name="line.349"></a>
<span class="sourceLineNo">350</span>   * @return the output of processing the lines<a name="line.350"></a>
<span class="sourceLineNo">351</span>   * @throws IOException if an I/O error occurs<a name="line.351"></a>
<span class="sourceLineNo">352</span>   */<a name="line.352"></a>
<span class="sourceLineNo">353</span>  public static &lt;R extends Readable &amp; Closeable, T&gt; T readLines(<a name="line.353"></a>
<span class="sourceLineNo">354</span>      InputSupplier&lt;R&gt; supplier, LineProcessor&lt;T&gt; callback) throws IOException {<a name="line.354"></a>
<span class="sourceLineNo">355</span>    Closer closer = Closer.create();<a name="line.355"></a>
<span class="sourceLineNo">356</span>    try {<a name="line.356"></a>
<span class="sourceLineNo">357</span>      R r = closer.add(supplier.getInput());<a name="line.357"></a>
<span class="sourceLineNo">358</span>      LineReader lineReader = new LineReader(r);<a name="line.358"></a>
<span class="sourceLineNo">359</span>      String line;<a name="line.359"></a>
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<span class="sourceLineNo">366</span>    } catch (Throwable e) {<a name="line.366"></a>
<span class="sourceLineNo">367</span>      throw closer.rethrow(e, IOException.class);<a name="line.367"></a>
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<span class="sourceLineNo">369</span>      closer.close();<a name="line.369"></a>
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<span class="sourceLineNo">372</span><a name="line.372"></a>
<span class="sourceLineNo">373</span>  /**<a name="line.373"></a>
<span class="sourceLineNo">374</span>   * Joins multiple {@link Reader} suppliers into a single supplier.<a name="line.374"></a>
<span class="sourceLineNo">375</span>   * Reader returned from the supplier will contain the concatenated data<a name="line.375"></a>
<span class="sourceLineNo">376</span>   * from the readers of the underlying suppliers.<a name="line.376"></a>
<span class="sourceLineNo">377</span>   *<a name="line.377"></a>
<span class="sourceLineNo">378</span>   * &lt;p&gt;Reading from the joined reader will throw a {@link NullPointerException}<a name="line.378"></a>
<span class="sourceLineNo">379</span>   * if any of the suppliers are null or return null.<a name="line.379"></a>
<span class="sourceLineNo">380</span>   *<a name="line.380"></a>
<span class="sourceLineNo">381</span>   * &lt;p&gt;Only one underlying reader will be open at a time. Closing the<a name="line.381"></a>
<span class="sourceLineNo">382</span>   * joined reader will close the open underlying reader.<a name="line.382"></a>
<span class="sourceLineNo">383</span>   *<a name="line.383"></a>
<span class="sourceLineNo">384</span>   * @param suppliers the suppliers to concatenate<a name="line.384"></a>
<span class="sourceLineNo">385</span>   * @return a supplier that will return a reader containing the concatenated<a name="line.385"></a>
<span class="sourceLineNo">386</span>   *     data<a name="line.386"></a>
<span class="sourceLineNo">387</span>   */<a name="line.387"></a>
<span class="sourceLineNo">388</span>  public static InputSupplier&lt;Reader&gt; join(<a name="line.388"></a>
<span class="sourceLineNo">389</span>      final Iterable&lt;? extends InputSupplier&lt;? extends Reader&gt;&gt; suppliers) {<a name="line.389"></a>
<span class="sourceLineNo">390</span>    checkNotNull(suppliers);<a name="line.390"></a>
<span class="sourceLineNo">391</span>    return new InputSupplier&lt;Reader&gt;() {<a name="line.391"></a>
<span class="sourceLineNo">392</span>      @Override public Reader getInput() throws IOException {<a name="line.392"></a>
<span class="sourceLineNo">393</span>        return new MultiReader(suppliers.iterator());<a name="line.393"></a>
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<span class="sourceLineNo">395</span>    };<a name="line.395"></a>
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<span class="sourceLineNo">397</span><a name="line.397"></a>
<span class="sourceLineNo">398</span>  /** Varargs form of {@link #join(Iterable)}. */<a name="line.398"></a>
<span class="sourceLineNo">399</span>  public static InputSupplier&lt;Reader&gt; join(<a name="line.399"></a>
<span class="sourceLineNo">400</span>      InputSupplier&lt;? extends Reader&gt;... suppliers) {<a name="line.400"></a>
<span class="sourceLineNo">401</span>    return join(Arrays.asList(suppliers));<a name="line.401"></a>
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<span class="sourceLineNo">403</span><a name="line.403"></a>
<span class="sourceLineNo">404</span>  /**<a name="line.404"></a>
<span class="sourceLineNo">405</span>   * Discards {@code n} characters of data from the reader. This method<a name="line.405"></a>
<span class="sourceLineNo">406</span>   * will block until the full amount has been skipped. Does not close the<a name="line.406"></a>
<span class="sourceLineNo">407</span>   * reader.<a name="line.407"></a>
<span class="sourceLineNo">408</span>   *<a name="line.408"></a>
<span class="sourceLineNo">409</span>   * @param reader the reader to read from<a name="line.409"></a>
<span class="sourceLineNo">410</span>   * @param n the number of characters to skip<a name="line.410"></a>
<span class="sourceLineNo">411</span>   * @throws EOFException if this stream reaches the end before skipping all<a name="line.411"></a>
<span class="sourceLineNo">412</span>   *     the bytes<a name="line.412"></a>
<span class="sourceLineNo">413</span>   * @throws IOException if an I/O error occurs<a name="line.413"></a>
<span class="sourceLineNo">414</span>   */<a name="line.414"></a>
<span class="sourceLineNo">415</span>  public static void skipFully(Reader reader, long n) throws IOException {<a name="line.415"></a>
<span class="sourceLineNo">416</span>    checkNotNull(reader);<a name="line.416"></a>
<span class="sourceLineNo">417</span>    while (n &gt; 0) {<a name="line.417"></a>
<span class="sourceLineNo">418</span>      long amt = reader.skip(n);<a name="line.418"></a>
<span class="sourceLineNo">419</span>      if (amt == 0) {<a name="line.419"></a>
<span class="sourceLineNo">420</span>        // force a blocking read<a name="line.420"></a>
<span class="sourceLineNo">421</span>        if (reader.read() == -1) {<a name="line.421"></a>
<span class="sourceLineNo">422</span>          throw new EOFException();<a name="line.422"></a>
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<span class="sourceLineNo">424</span>        n--;<a name="line.424"></a>
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<span class="sourceLineNo">426</span>        n -= amt;<a name="line.426"></a>
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<span class="sourceLineNo">431</span>  /**<a name="line.431"></a>
<span class="sourceLineNo">432</span>   * Returns a Writer that sends all output to the given {@link Appendable}<a name="line.432"></a>
<span class="sourceLineNo">433</span>   * target. Closing the writer will close the target if it is {@link<a name="line.433"></a>
<span class="sourceLineNo">434</span>   * Closeable}, and flushing the writer will flush the target if it is {@link<a name="line.434"></a>
<span class="sourceLineNo">435</span>   * java.io.Flushable}.<a name="line.435"></a>
<span class="sourceLineNo">436</span>   *<a name="line.436"></a>
<span class="sourceLineNo">437</span>   * @param target the object to which output will be sent<a name="line.437"></a>
<span class="sourceLineNo">438</span>   * @return a new Writer object, unless target is a Writer, in which case the<a name="line.438"></a>
<span class="sourceLineNo">439</span>   *     target is returned<a name="line.439"></a>
<span class="sourceLineNo">440</span>   */<a name="line.440"></a>
<span class="sourceLineNo">441</span>  public static Writer asWriter(Appendable target) {<a name="line.441"></a>
<span class="sourceLineNo">442</span>    if (target instanceof Writer) {<a name="line.442"></a>
<span class="sourceLineNo">443</span>      return (Writer) target;<a name="line.443"></a>
<span class="sourceLineNo">444</span>    }<a name="line.444"></a>
<span class="sourceLineNo">445</span>    return new AppendableWriter(target);<a name="line.445"></a>
<span class="sourceLineNo">446</span>  }<a name="line.446"></a>
<span class="sourceLineNo">447</span>}<a name="line.447"></a>




























































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